Sustainable building operating costs are generally very low, but the construction process has to spend a lot of money. So, unlike other "green" project, we propose a creative concept - a multi-level sustainable building, this concept will use the family's economic ability and willingness to buy as one of the important consideration, because there is no market to continuing construction is unrealistic.

"Buildability" is the most prominent feature of this concept. The adoptions of the plan are similar house down the double tetrahedron inverted pyramid structure of the assembly to improve building efficiency.